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A trans man (sometimes trans-man or transman) is a female-to-male (FTM or F2M) transgender person who was assigned female at birth (AFAB/DFAB) but has a male gender identity. The label of transgender man is not always interchangeable with that of transsexual man, although the two labels are often used in this way. Transgender is an umbrella term that includes different types of gender variant people (including transsexual people). Many trans men choose to undergo surgical or hormonal transition, or both (see sex reassignment therapy), to alter their appearance in a way that aligns with their gender identity more appropriately or alleviates gender dysphoria.

The term trans man is used as a short form for either identity (transsexual man and transgender man).[5] Trans men may identify as transsexual, as transgender, neither, or both.[6]Transgender man is an umbrella term that may include anybody who was assigned female at birth (called afab), but identifies as male. For instance, some androgynous, bigender, and genderqueer people might identify as transgender.[5] Because transgender is an umbrella term, it is imprecise and does not adequately describe specific identities and experiences.[7]

The term transsexual originated in the medical and psychological communities. However, unlike the term transgender, transsexual is not an umbrella term, and many transgender people do not identify as such.[6]Transsexual is a term for afab and amab people alike who feel their sex organs do not reflect their gender and have chosen to change some aspect of their body; it is an older term, with GLAAD stating that it is "still preferred by some people who have permanently changed - or seek to change - their bodies through medical interventions (including but not limited to hormones and/or surgeries)."[6]

The FTM community coined the term transfag to describe a trans man attracted to other men. However, this phrase is still controversial because of its previous usage as a derogatory slur directed towards trans women.

Originally, the term trans men referred specifically to female-to-male transsexual people who underwent hormone replacement therapy (HRT) or surgery (SRS), or both. The definition of transition has broadened to include theories of psychological development or complementary methods of self-acceptance.[8][9]

Transsexual men may seek medical interventions such as hormones and surgery to make their bodies as congruent as possible with their gender presentation. However, many transgender and transsexual men cannot afford or choose not to undergo surgery or hormone replacement therapy.

Many who have not undergone top surgery choose to bind their breasts. There are a few different methods of binding, including using sports bras and specially made binders (which can be vest-type, or wrap-around style). Tape or bandages, although often depicted in popular culture, should never be used for binding as they tighten with wear and compress the ribcage, and could result in injury.

Some trans men might also decide to pack, to create a male like bulge in the crotch of clothing. However, this is not universal. Trans men who decide to pack may use anything from rolled up socks to specially made packers, which resemble a penis. Some packers are also created for trans men to be able to urinate through them (stand-to-pee, or STP, devices).

Legal affirmation: name and (sometimes) sex marker correction in legal identification documents.[11][12] Being socially accepted as male (sometimes known as passing) may be challenging for trans men who have not undergone HRT and/or surgery.[11][12] Some trans men may choose to present as female in certain social situations (e.g. at work).[11][12] After physical transition, trans men usually live full-time as male.[11][12]